[FIX] stock: UoM in qty check

- Enable lot tracking on Product A
- UoM of Product A is kg, but Purchase UoM is lb(s)
- Create a PO for 200 lb(s) of Product A, confirm
- Go in the picking, specify the lots.
- Validate, and error: 'You have a difference between the quantity...'

This is because `lot_quantities` contains the quantities in kg, while
`operation.product_qty` is in lb(s).

opw-705259

addons/stock/models/stock_move.py

@@ -797,7 +797,11 @@ class StockMove(models.Model):
             # compute quantities for each lot + check quantities match
             lot_quantities = dict((pack_lot.lot_id.id, operation.product_uom_id._compute_quantity(pack_lot.qty, operation.product_id.uom_id)
             ) for pack_lot in operation.pack_lot_ids)
-            if operation.pack_lot_ids and float_compare(sum(lot_quantities.values()), operation.product_qty, precision_rounding=operation.product_uom_id.rounding) != 0.0:
+
+            qty = operation.product_qty
+            if operation.product_uom_id and operation.product_uom_id != operation.product_id.uom_id:
+                qty = operation.product_uom_id._compute_quantity(qty, operation.product_id.uom_id)
+            if operation.pack_lot_ids and float_compare(sum(lot_quantities.values()), qty, precision_rounding=operation.product_id.uom_id.rounding) != 0.0:
                 raise UserError(_('You have a difference between the quantity on the operation and the quantities specified for the lots. '))
 
             quants_taken = []